RE: [meteorite-list] Chassigny Chondrules

[Treiman, Allan]

Hi, all.      Chassigny contains no chondrules. It does have spherical and ellipsoidal inclusions in its olivine crystals. The inclusions contain silica-rich glass, pryoxene sprays, amphibole, whitlockite, and biotite. Their textures look a bit like chondrules, but that only represents the same physical conditions: rapid cooling of silicate magma.    Several papers in the technical literature have nice photos of these magmatic inclusions: 1) Floran et al., 1978, Geochim. Cosmochim. Acta 42, 1213-1229. 2) Johnson et al., 1991, Geochim. Cosmochim. Acta 55, 349-366.        The idea of chondrules in Chassigny dates back at least to 1962, in the paper Jeremine E., Orcel J., and Sandrea A. (1962) Etude mineralogique et structurale de la meteorite de Chassigny. Bull. Soc. fr. Mineral. Crist. LXXXV, 262-266. They showed pictures of the magmatic inclusions, and (apparently thinking only of chondrite meteorites, and not 'normal' igneous rocks) called them "chondre naissant."      Cheers     Allan   Allan H. Treiman Senior Staff Scientist Lunar and Planetary Institute 3600 Bay Area Boulevard Houston, TX 77058-1113    281-486-2117    281-486-2162 (FAX) -----Original Message----- From: mark ford [mailto:[EMAIL PROTECTED] Sent: Monday, July 28, 2003 9:43 AM To: [EMAIL PROTECTED] Subject: [meteorite-list] Chassigny Chondrules       Hi,   Does anyone know what the current thinking on the ‘Chassigny Chondrules’ is?  - (as to what they actually are or how they formed?)   I found this, but can anyone point me in the direction of any further information?   http://www.geocities.com/~dweir/chassig1.htm     Cheers Mark F.